What was the Morph suppose to do Originally? I have done many morphs with Z Brush with no Ill effect.. http://www.3dcommune.com/3d/store/more_info.mv?P1074333664 Maybe you try to have the morph do to much? If you want to change the whole face.First do one for the chin then another for the brow then another for the cheeks and so on....Don't do one to change the whole face at once..